CN211790793U - Retired battery echelon utilization system - Google Patents
Retired battery echelon utilization system Download PDFInfo
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- CN211790793U CN211790793U CN202020841826.1U CN202020841826U CN211790793U CN 211790793 U CN211790793 U CN 211790793U CN 202020841826 U CN202020841826 U CN 202020841826U CN 211790793 U CN211790793 U CN 211790793U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/12—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation
- Y04S10/123—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation the energy generation units being or involving renewable energy sources
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/14—Energy storage units
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The utility model provides a retired battery echelon utilizes system, include: an energy storage system, a photovoltaic system and an off-grid load; the energy storage system comprises an energy storage converter, the energy storage converter comprises a plurality of power modules, the alternating current sides of the power modules are all connected to an alternating current bus of the energy storage system, the direct current side of at least one power module is connected with a retired battery pack, and the direct current side of at least one power module is connected with a new battery pack; the energy storage converter also comprises a centralized control unit, wherein the centralized control power supply is respectively connected with the plurality of power modules and is used for controlling and adjusting the working parameters of the power modules according to the received instructions; and an alternating current bus of the energy storage system is respectively connected with the photovoltaic system and an alternating current bus of the off-grid load in parallel and is connected with the power grid through the on-grid and off-grid switching cabinet. The utility model discloses combine together to constitute light with energy storage system, photovoltaic system and from net load and store up little grid system, through and from the nimble access mode of switching the grid-connected and leaving the net of net switch cabinet, the flexibility is strong.
Description
Technical Field
The utility model relates to a retired battery utilizes technical field, especially a retired battery echelon utilization system.
Background
With the vigorous development of the new energy automobile industry, especially with the rapid increase of the yield of new energy automobiles in recent years, the retired power batteries are increasing. The automobile power battery is mainly a lithium battery at present, the performance of the power battery is attenuated along with the increase of charging and discharging times, when the capacity of the battery is attenuated to be below 80% of the rated capacity, not only is the user experience worsened, but also potential safety hazards are brought under the complex working condition of the power battery. In order to ensure the power performance, driving range and safety during use of the electric automobile, the power battery of the electric automobile must be replaced, and the number of the retired power batteries is increasing. However, the retired power battery still usually has 70% to 80% of available capacity, and the direct scrapping is a waste of resources.
Therefore, at present, the gradient utilization of the retired battery of the automobile is mostly performed on a single battery or a single battery group, which cannot be scaled and cannot meet the requirement of the gradient utilization of the power battery of the automobile on a large scale, and therefore, a new gradient utilization system for the retired battery of the automobile is provided.
SUMMERY OF THE UTILITY MODEL
To the above problem, the utility model aims at providing a retired battery echelon utilizes system.
The purpose of the utility model is realized by adopting the following technical scheme:
a retired battery echelon utilization system is provided, which comprises: an energy storage system, a photovoltaic system and an off-grid load;
the energy storage system comprises an energy storage converter, the energy storage converter comprises a plurality of power modules, the alternating current sides of the power modules are all connected to an alternating current bus of the energy storage system, the direct current side of at least one power module is connected with a retired battery pack, and the direct current side of at least one power module is connected with a new battery pack;
the energy storage converter also comprises a centralized control unit, wherein the centralized control power supply is respectively connected with the plurality of power modules and is used for controlling and adjusting the working parameters of the power modules according to the received instructions;
and an alternating current bus of the energy storage system is respectively connected with the photovoltaic system and an alternating current bus of the off-grid load in parallel and is connected with the power grid through the on-grid and off-grid switching cabinet.
Preferably, a plurality of dc branches are provided on the dc side of the power module, wherein each dc branch is connected to a group of retired battery packs.
Preferably, the centralized control unit is also in communication connection with the energy storage management system.
Preferably, the energy storage management system is further connected with the photovoltaic system and the off-grid load respectively, and is used for collecting telemetering information, telesignaling information and accumulated quantity information of the photovoltaic system, the energy storage system and the off-grid load in real time and sending control instructions to the photovoltaic system, the energy storage system and the off-grid load.
Preferably, the retired battery pack consists of automobile retired batteries; the ex-service battery pack and the new battery pack are both arranged in the battery cabinet, wherein the ex-service battery pack and the new battery pack adopt lithium iron phosphate batteries, and a single battery cell is used as an energy storage medium;
and a battery management system is arranged in the battery cabinet to realize the management of the battery cabinet, wherein the battery management system is also connected with the energy storage management system.
Preferably, the battery management system comprises a decommissioned battery management unit, and the decommissioned battery management unit is respectively connected with each decommissioned battery pack in the battery cabinet.
Preferably, the energy storage management system comprises a data acquisition unit, a monitoring alarm unit, a Web release unit and an energy scheduling unit.
Preferably, the dc side and the ac side of the power module are provided with a dc breaker and an ac breaker, respectively.
Preferably, the energy storage management system is further in communication connection with a local monitoring system and/or an energy management cloud platform.
Preferably, the grid-connected and off-grid switch cabinet is also in communication connection with the energy storage management system.
The utility model has the advantages that:
1) the utility model discloses with the energy storage system that car retired battery is constituteed, combine together with photovoltaic system and from the net load and constitute light storage micro grid system, through and from the nimble access mode of switching the grid-connected and from the net of net switch cabinet, the accessible sets up the realization peak shifting to the charge-discharge period when being incorporated into the power networks and fills out advantages such as valley storage power consumption. And when the off-grid operation is carried out, the stable operation of the photovoltaic system is maintained, and the off-grid load is continuously supplied with power.
2) The energy storage converter is internally provided with a plurality of power modules which jointly provide energy storage and functions, and the plurality of power modules can be freely adjusted through an energy storage management system, so that the alternate rest of internal power modules is realized, and the low-efficiency operation under low load is effectively reduced; the power module is flexibly switched in and out, and can be quickly replaced to restore the system after a fault, and the maintainability is high.
3) The energy storage system can uniformly manage a large number of retired battery packs, and the energy storage converter controls charging and discharging of the retired battery packs consisting of a plurality of retired batteries, so that echelon utilization of the retired batteries is realized.
Drawings
The present invention is further explained by using the drawings, but the embodiments in the drawings do not constitute any limitation to the present invention, and for those skilled in the art, other drawings can be obtained according to the following drawings without any inventive work.
Fig. 1 is a schematic diagram of an optical storage microgrid system;
fig. 2 is a schematic diagram of an energy storage system.
Detailed Description
The invention is further described in connection with the following application scenarios.
Based on a plurality of 80V/60Ah automobile retired power lithium battery, a 100kW/400kWh scale energy storage system is planned to manage the retired power lithium battery, wherein the energy storage system comprises 5-6 branches of retired batteries and 1 branch of brand new batteries, and the energy storage system requires operation under two working conditions of grid connection and grid disconnection. In addition, the energy storage system is configured with a 50kWp photovoltaic system and an off-grid load, is integrated with an energy storage management system, receives remote management of a superior master station, and meets the functions of remote signaling, remote measuring, remote control and remote regulation.
Referring to fig. 1, a schematic diagram of an optical storage microgrid composed of an energy storage system, a photovoltaic system and an off-grid load is shown, wherein the energy storage system, the photovoltaic system and the off-grid load are connected in parallel on an alternating current side and are connected through a grid of a grid-connected and off-grid switch cabinet. For the energy storage system, 1 90kW modular energy storage converter is selected to manage the battery, and a single power module is 30 kW. 6 branches of 2 power modules are respectively connected to 6 groups of 320V/60Ah retired batteries, and the other 1 power module is connected to 2 groups of 307.2V/100Ah new batteries. The total energy storage capacity is 90kW/176.6kWh, with the retired batteries totaling 115.2kWh, converted in capacity 80%, actual capacity 92.16kWh, new battery capacity 61.44 kWh. For the retired batteries, each branch adopts a grouping mode that 4 80V/60Ah battery packs are connected in series. For new batteries, each group is composed of 6 51.2V/100Ah battery packs connected in series. The structure of the energy storage system is shown in fig. 2.
The light storage micro-grid system has two operation modes of grid-connected operation and off-grid operation, peak shifting and valley filling can be realized by setting the charging and discharging time periods during grid-connected operation, and peak-valley electricity price difference is earned. And when the off-grid operation is carried out, the stable operation of the photovoltaic system is maintained, and the off-grid load is continuously supplied with power.
The batteries of all channels are managed independently, the batteries can be charged at constant voltage, constant current and constant power, the batteries can be discharged at constant current and constant power, and the charging and discharging parameters can be adjusted. Each direct current channel is electrically isolated, and the problem of inter-group circulation caused by difference between the battery packs is effectively solved.
And fast (20ms) grid-connected and off-grid switching is realized, and a modular grid-connected and off-grid switching unit is selected, so that the fast isolation of the optical storage system and the power grid is realized when the power grid fails, and the power consumption of important loads is guaranteed. And after the power grid is recovered, the grid is connected again, and the system is switched to an off-grid mode to operate, so that smooth transition is realized.
The load type control circuit is suitable for various different load types, including rectification, resistance, capacitance, inductance, impact, pump type, motor type, fan type loads and half-wave light loads, and effectively guarantees reliable electricity utilization of customers.
The internal power channel has alternate rest, so that the low-efficiency operation under low load is effectively reduced; the channel is switched in and out flexibly, the module can be replaced quickly after the fault so as to recover the system, and the maintainability is high.
Further, the energy storage converter comprises 6 10kW DC/DC power modules and 1 30kW DC/DC power module, 3 30kW DC/AC power modules and 2 60kW grid-connected and off-grid switching units.
Furthermore, the 90kW grid-connected and off-grid energy storage converter is composed of 3 30kW power units, the design of wide direct current voltage is adopted, the direct current input voltage is 200V-900V, and constant power charging and discharging can be carried out within the range of 280V-900V. The system is suitable for various power grid voltages, including AC220V/AC230V/AC380V/AC 400V. A single power unit contains 3 direct current channels at most, and perfectly matches a power battery echelon utilization scene. Have photovoltaic MPPT function, the integrative power generation system that unites of light storage of being convenient for.
The energy management system can collect various related telemetering, remote signaling, accumulated quantity and other automatic information such as photovoltaic, energy storage and charging pile in real time, and send various data information and remote control and remote regulation commands to each device. Meanwhile, the system has the functions of analog quantity processing, state quantity processing, non-actual measurement data processing, planned value processing, data quality code, calculation, statistics and the like. Besides the conventional three-remote (remote measurement, remote signaling and remote control) functions, the system provides a unique monitoring and analyzing function for photovoltaic and energy storage power stations.
The energy management system comprises a data acquisition unit, a monitoring alarm unit, a Web release unit and an energy scheduling unit.
The data acquisition unit is used for acquiring and processing the energy storage converter (PCS) and the Battery Management System (BMS), acquiring the daily generated energy of the photovoltaic, the daily charge and discharge capacity of the energy storage converter and the chargeable and dischargeable capacity of the battery, counting monthly data and annual data, and visually displaying the monthly data and the annual data in the forms of a curve chart, a histogram and the like. And the export of an Excel format is supported.
The monitoring alarm unit is used for displaying networking information of the current optical storage system in a system topology mode, the networking information comprises main information such as working states of equipment such as an energy storage converter and a battery and real-time power, and details of the single equipment can be seen by clicking an icon of each equipment. And on-off control, active power setting, reactive power setting and important parameter setting of corresponding equipment can be carried out on the equipment control interface. The system also has the functions of automatic accident signal popup, audible and visual alarm and short message prompt (optional), supports a first-level alarm and a second-level alarm, and can set the types of event faults (general events, abnormal alarms and equipment faults) and the alarm modes by a user according to requirements.
The Web publishing unit is used for carrying out local control on the whole power station, communicating with remote monitoring equipment and realizing remote access. In addition, the power dispatching of the power grid is also met by communicating with a power grid dispatching center.
The energy scheduling unit is used for scheduling the power of the photovoltaic and the energy storage in real time under the condition that the system is off-grid, controlling the energy storage to charge when the photovoltaic power is greater than the load power, and limiting the photovoltaic after the energy storage is full; when the photovoltaic power is smaller than the load power, controlling the stored energy to discharge and supplying power to the load together with the photovoltaic power; and when the energy storage voltage is too low or too high, the system is protected.
Furthermore, the retired battery pack consists of automobile retired batteries; the ex-service battery pack and the new battery pack are both arranged in the battery cabinet, wherein the ex-service battery pack and the new battery pack adopt lithium iron phosphate batteries, and a single battery cell is used as an energy storage medium; a high-safety energy storage type lithium iron phosphate battery is adopted, and a single battery cell (3.2V/100Ah) is used as an energy storage medium. The battery cabinet is provided with a battery management system, and functions of battery protection, charge and discharge management, temperature control, remote monitoring and the like are realized. And each 16 electric cores are combined into 1 and 16 series of battery packs, and 12 battery packs are arranged in 1 battery cabinet. The battery cabinet management adopts the second grade modular structure, follows accuse unit (BMU) and installs respectively in each battery box, and main control module (BMS) is installed in the top layer high-voltage box, and main control (BMS) removes the information interaction who satisfies with BMU, control demand, the safe and reliable operation of realization energy storage battery, still satisfies the information exchange requirement with the PCS system.
Aiming at the problem that the performance reduction speed of the retired battery is uneven under the long-time operation, in order to ensure the working quality of the whole energy storage system, a retired battery management unit is further arranged in the battery cabinet and is respectively connected with each retired battery pack in the battery cabinet. Under the off-grid state, the retired battery management unit collects working parameters (including battery parameters such as total electric quantity and output power) of the retired battery pack to generate a corresponding retired battery pack observation log, and meanwhile, a parameter change curve is generated according to changes of the working parameters of the retired battery, so that managers can record and manage aging and attenuation degrees of the retired battery in real time, and replace the retired battery pack which does not reach the standard in time.
It should be finally noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, a person skilled in the art should analyze that the technical solutions of the present invention can be modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention.
Claims (8)
1. A retired battery echelon utilization system, comprising: an energy storage system, a photovoltaic system and an off-grid load;
the energy storage system comprises an energy storage converter, the energy storage converter comprises a plurality of power modules, the alternating current sides of the power modules are all connected to an alternating current bus of the energy storage system, the direct current side of at least one power module is connected with a decommissioned battery pack, and the direct current side of at least one power module is connected with a new battery pack;
the energy storage converter also comprises a centralized control unit, and the centralized control power supply is respectively connected with the plurality of power modules;
and the alternating current bus of the energy storage system is respectively connected with the photovoltaic system and the alternating current bus of the off-grid load in parallel and is connected with the power grid through the on-grid and off-grid switch cabinet.
2. The decommissioned battery echelon utilization system according to claim 1, wherein a plurality of dc branches are provided on the dc side of the power module, wherein each dc branch is connected to a respective one of the decommissioned battery packs.
3. The decommissioned battery echelon utilization system of claim 1, wherein the centralized control unit is further communicatively coupled to an energy storage management system.
4. The decommissioned battery echelon utilization system according to claim 3, wherein the energy storage management system is further connected to the photovoltaic system and the off-grid load, respectively, and is configured to collect telemetry information, and accumulated amount information of the photovoltaic system, the energy storage system, and the off-grid load in real time, and send a control command to the photovoltaic system, the energy storage system, and the off-grid load.
5. The decommissioned battery echelon utilization system of claim 3, wherein the decommissioned battery pack consists of automobile decommissioned batteries; the ex-service battery pack and the new battery pack are both arranged in the battery cabinet, wherein the ex-service battery pack and the new battery pack adopt lithium iron phosphate batteries, and a single battery cell is used as an energy storage medium;
and a battery management system is arranged in the battery cabinet to realize the management of the battery cabinet, wherein the battery management system is also connected with the energy storage management system.
6. The retired battery echelon utilization system according to claim 3 or 5, wherein the energy storage management system comprises a data acquisition unit, a monitoring alarm unit, a Web release unit and an energy scheduling unit.
7. The decommissioned battery echelon utilization system of claim 1, wherein the dc side and the ac side of the power module are provided with a dc breaker and an ac breaker, respectively.
8. The decommissioned battery echelon utilization system of claim 3, wherein the energy storage management system is further communicatively connected to a local monitoring system and/or an energy management cloud platform.
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| CN202020841826.1U CN211790793U (en) | 2020-05-19 | 2020-05-19 | Retired battery echelon utilization system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114156925A (en) * | 2021-11-30 | 2022-03-08 | 贵州电网有限责任公司 | Building block splicing type mobile energy storage system and parallel capacity increasing method thereof |
| CN116995713A (en) * | 2023-09-26 | 2023-11-03 | 江苏华友能源科技有限公司 | Method for utilizing residual electric quantity of retired battery of electric automobile |
-
2020
- 2020-05-19 CN CN202020841826.1U patent/CN211790793U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114156925A (en) * | 2021-11-30 | 2022-03-08 | 贵州电网有限责任公司 | Building block splicing type mobile energy storage system and parallel capacity increasing method thereof |
| CN114156925B (en) * | 2021-11-30 | 2024-01-30 | 贵州电网有限责任公司 | Building block spliced mobile energy storage system and parallel capacity increasing method thereof |
| CN116995713A (en) * | 2023-09-26 | 2023-11-03 | 江苏华友能源科技有限公司 | Method for utilizing residual electric quantity of retired battery of electric automobile |
| CN116995713B (en) * | 2023-09-26 | 2023-12-08 | 江苏华友能源科技有限公司 | Method for utilizing residual electric quantity of retired battery of electric automobile |
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